Label-free particle sensing by fiber taper-based Raman spectroscopy

Perry S. Edwards, Corey T. Janisch, Bo Peng, Jiangang Zhu, Sahin Ozdemir, Lan Yang, Zhiwen Liu

Research output: Contribution to journalArticle

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Abstract

A fiber taper-based method for label-free Raman sensing is presented, which exploits the interaction between adsorbed specimen and the exposed evanescence tail of guided pump light. Chemical specificity and detection of microsphere specimens with diameters as small as 1 μ m are shown. To improve the sensitivity, we further propose resonator-enhanced Raman spectroscopy by taking advantage of the power build-up of a resonant mode in a cavity. Proof of concept is demonstrated by incorporating a fiber taper within a fiber ring resonator and locking a tunable laser to a circulating resonant mode. This demonstration shows a modest 40% enhancement of the Raman signal.

Original languageEnglish (US)
Article number6883158
Pages (from-to)2093-2096
Number of pages4
JournalIEEE Photonics Technology Letters
Volume26
Issue number20
DOIs
Publication statusPublished - Oct 15 2014

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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